5. Sexual dimorphism in the primary and permanent dentitions of twins: an approach to clarifying the role of hormonal factorsDaniela Ribeiro, Wayne Sampson, Toby Hughes, Alan Brook and Grant TownsendDOI: http://dx.doi.org/10.1017/UPO9780987171870.006

8. Non-metric dental characteristics in Papua New Guinea Highlanders and their association with molar reductionEisaku Kanazawa and Masanobu MatsunoDOI: http://dx.doi.org/10.1017/UPO9780987171870.009

9. The Main Occluding Area between opposing teeth during chewing: a comparison between Australians and JapaneseHiroshi Takayama, Hitoshi Kato and Grant TownsendDOI: http://dx.doi.org/10.1017/UPO9780987171870.010

This book contains papers arising from a symposium held during a combined meeting of The International Union of Anthropological and Ethnological Sciences (IUAES), The Australian Anthropological Society (AAS) and The Association of Social Anthropologists of Aotearoa New Zealand at the University of Western Australia from July 5-8th, 2011. It follows on from a recently published Special Issue Supplement of Archives of Oral Biology, Volume 54, December 2009 that contains papers from an International Workshop on Oral Growth and Development held in Liverpool in 2007 and edited by Professor Alan Brook. Together, these two publications provide a comprehensive overview of state-of-the-art approaches to the study of dental development and variation, and open up opportunities for future collaborative research initiatives, a key aim of the International Collaborating Network in Oro-facial Genetics and Development that was founded in Liverpool in 2007.

The aim of the symposium held at The University of Western Australia in 2011 was to emphasise some of the powerful new strategies offered by the science of dental anthropology to elucidate the historical lineage of human groups and also to reconstruct environmental factors that have acted on the teeth by analysing dental morphological features. In recent years, migration, as well as increases and decreases in the size of different human populations, have been evident as a result of globalisation. Dental features are also changing associated with changes in nutritional status, different economic or social circumstances, and intermarriage between peoples. Dental anthropological studies have explored these changes with the use of advanced techniques and refined methodologies. New paradigms are also evolving in the field of dental anthropology.

When considered together with the recent special issue of Archives of Oral Biology that highlighted the importance of research approaches focused at both the molecular and phenotypic levels, it is clear that we have now reached a very exciting stage in our ability to address key questions and issues about the normal and abnormal development of the dentition, as well as the diseases that commonly affect our teeth and gums.